Credentials support for ZIP and TAR

[pijaro]

This PR allows passing credentials for ZIP/TAR repositories using environment variables. It modifies the load_url call by utilizing a Request object with the Authorization field populated from environment variables based on a user-defined key.

A new field, credentials_key: <KEY>, is introduced in the repository configuration file. This key identifies the environment variables that hold the required credential information:

• VCS_<KEY>_AUTHENTICATION_METHOD – Authentication method:
  • Basic for username and password.
  • Bearer or Token for token-based authentication.
• VCS_<KEY>_USERNAME – Username for Basic authentication.
• VCS_<KEY>_PASSWORD – Password for Basic authentication.
• VCS_<KEY>_TOKEN – Token for Bearer or Token authentication.

Additionally, an option to ignore SSL certificate verification is provided for self-signed hosts: VCS_IGNORE_SSL_CERTIFICATE=True

This solution is simple to configure and does not introduce additional dependencies.